Installs and adjusts easily. Just don't over tighten the screws or "crack", you will break the plastic face. Product needs something on the back ring to provide a little resistance to rotation, not a issue unless you play with the plastic face piece.

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Q:

Can you get more than one that can use the same key?

A:

According to Perko, they are all designed in the same way and work with the same key.